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still under 400 hp

This is a discussion on still under 400 hp within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by speeedo sum pepole adivce me to put the new ls3 heads its 63cc and 230 intake runner ...

  1. #21
    Senior Member Bottesini's Avatar
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    Quote Originally Posted by speeedo View Post
    sum pepole adivce me to put the new ls3 heads its 63cc and 230 intake runner what you think guys ? they are kinda cheap and do the job
    That is my plan so far when I build up my next engine. At $200 each from GM for bare castings it is hard to beat that price for what you get. They are no means the best choice, but for my budget it is right now.

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    i change the Fuel Pumps and i run it on the dayno and i got 425 rwhp the problem was from the pumps but still i should get more hp if i chang the heads any way thanks guys for your help

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    Quote Originally Posted by Mr. Luos View Post
    Yes.

    Your stock pump isn't good to much over 400HP.
    Injectors...should be 36-42 pounders.
    I figured the stock pump would be good up to 500hp NA... that was always my assesment given this is a biger motor requiring more fuel...

    I would say 42 don't bother with 36 if 36's work I would say they'll still be cycling over 90% which is too high if you can help it... go 42 will still be easy to tune...

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    Quote Originally Posted by speeedo View Post
    i change the Fuel Pumps and i run it on the dayno and i got 425 rwhp the problem was from the pumps but still i should get more hp if i chang the heads any way thanks guys for your help
    fuel pumps?... fuel pump and injectors? or just the injectors?

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    Quote Originally Posted by Bouvers View Post
    fuel pumps?... fuel pump and injectors? or just the injectors?
    i chang both the fuel pump and injectors

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    Quote Originally Posted by Bouvers View Post
    I figured the stock pump would be good up to 500hp NA... that was always my assesment given this is a biger motor requiring more fuel...

    I would say 42 don't bother with 36 if 36's work I would say they'll still be cycling over 90% which is too high if you can help it... go 42 will still be easy to tune...
    you are right i did change it to 42 sum one told me 60 but they are very hard to be tuned
    NOW guys what you think about nitro is 400 to much ?

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    yes....

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